x86: cleanup early per cpu variables/accesses v4

[sfrench/cifs-2.6.git] / include / asm-x86 / percpu.h

diff --git a/include/asm-x86/percpu.h b/include/asm-x86/percpu.h
index 736fc3bb8e1eaa1f8280ed471c70c6deffe20512..912a3a17b9db85958abee1464d58e64d798f5f31 100644 (file)
--- a/include/asm-x86/percpu.h
+++ b/include/asm-x86/percpu.h
@@ -143,4 +143,50 @@ do {                                                       \
 #define x86_or_percpu(var, val) percpu_to_op("or", per_cpu__##var, val)
 #endif /* !__ASSEMBLY__ */
 #endif /* !CONFIG_X86_64 */
+
+#ifdef CONFIG_SMP
+
+/*
+ * Define the "EARLY_PER_CPU" macros.  These are used for some per_cpu
+ * variables that are initialized and accessed before there are per_cpu
+ * areas allocated.
+ */
+
+#define        DEFINE_EARLY_PER_CPU(_type, _name, _initvalue)                  \
+       DEFINE_PER_CPU(_type, _name) = _initvalue;                      \
+       __typeof__(_type) _name##_early_map[NR_CPUS] __initdata =       \
+                               { [0 ... NR_CPUS-1] = _initvalue };     \
+       __typeof__(_type) *_name##_early_ptr = _name##_early_map
+
+#define EXPORT_EARLY_PER_CPU_SYMBOL(_name)                     \
+       EXPORT_PER_CPU_SYMBOL(_name)
+
+#define DECLARE_EARLY_PER_CPU(_type, _name)                    \
+       DECLARE_PER_CPU(_type, _name);                          \
+       extern __typeof__(_type) *_name##_early_ptr;            \
+       extern __typeof__(_type)  _name##_early_map[]
+
+#define        early_per_cpu_ptr(_name) (_name##_early_ptr)
+#define        early_per_cpu_map(_name, _idx) (_name##_early_map[_idx])
+#define        early_per_cpu(_name, _cpu)                              \
+       (early_per_cpu_ptr(_name) ?                             \
+               early_per_cpu_ptr(_name)[_cpu] :                \
+               per_cpu(_name, _cpu))
+
+#else  /* !CONFIG_SMP */
+#define        DEFINE_EARLY_PER_CPU(_type, _name, _initvalue)          \
+       DEFINE_PER_CPU(_type, _name) = _initvalue
+
+#define EXPORT_EARLY_PER_CPU_SYMBOL(_name)                     \
+       EXPORT_PER_CPU_SYMBOL(_name)
+
+#define DECLARE_EARLY_PER_CPU(_type, _name)                    \
+       DECLARE_PER_CPU(_type, _name)
+
+#define        early_per_cpu(_name, _cpu) per_cpu(_name, _cpu)
+#define        early_per_cpu_ptr(_name) NULL
+/* no early_per_cpu_map() */
+
+#endif /* !CONFIG_SMP */
+
 #endif /* _ASM_X86_PERCPU_H_ */